<!doctype html>
<html>

<head>
  <meta charset="utf8">
  <title>React DevTools</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <style>
    #panes {
      display: grid;
      gap: 5px;
      position: relative;
      overflow: hidden;
    }

    #divider {
      position: absolute;
      z-index: 10000002;
      background-color: #ccc;
      transition: background-color 0.2s;
    }

    #divider:hover,
    #divider.dragging {
      background-color: #aaa;
    }

    #divider.horizontal-divider {
      width: 100%;
      height: 5px;
      cursor: row-resize;
    }

    #divider.vertical-divider {
      width: 5px;
      height: 100%;
      cursor: col-resize;
    }

    #target {
      height: 100%;
      width: 100%;
      border: none;
      overflow-y: auto;
    }

    #devtools {
      height: 100%;
      width: 100%;
      overflow-y: auto;
      z-index: 10000001;
    }

    body {
      height: 100vh;
      width: 100vw;
      display: grid;
      grid-template-rows: auto 1fr;
      margin: 0;
      padding: 0;
      font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Helvetica, Arial,
        sans-serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol;
      font-size: 12px;
      line-height: 1.5;
    }

    .optionsRow {
      width: 100%;
      display: flex;
      padding: 0.25rem;
      background: aliceblue;
      border-bottom: 1px solid lightblue;
      box-sizing: border-box;
    }

    .optionsRowSpacer {
      flex: 1;
    }
  </style>
</head>

<body>
  <div class="optionsRow">
    <button id="mountButton">Unmount test app</button>
    <div class="optionsRowSpacer">&nbsp;</div>
    <span>
      <a href="/multi.html">multi DevTools</a>
      |
      <a href="/e2e.html">e2e tests</a>
      |
      <a href="/e2e-regression.html">e2e regression tests</a>
      |
      <a href="/perf-regression.html">perf regression tests</a>
    </span>

    <label style="margin-left: 4px">
      Layout:
      <select id="layout">
        <option value="leftright">Left/Right Split</option>
        <option value="topbottom">Top/Bottom Split</option>
      </select></label>
  </div>

  <div id="panes">
    <!-- React test app (shells/dev/app) is injected here -->
    <!-- DevTools backend (shells/dev/src) is injected here -->
    <!-- global "hook" is defined on the iframe's contentWindow -->
    <iframe id="target"></iframe>

    <!-- Draggable divider between panes -->
    <div id="divider"></div>

    <!-- DevTools frontend UI (shells/dev/src) renders here -->
    <div id="devtools"></div>
  </div>

  <!-- This script installs the hook, injects the backend, and renders the DevTools UI -->
  <!-- In DEV mode, this file is served by the Webpack dev server -->
  <!-- For production builds, it's built by Webpack and uploaded from the local file system -->
  <script src="dist/app-devtools.js"></script>
  <script type="module">
    let layoutType = 'leftright';
    let splitRatio = 0.5;
    let isDragging = false;

    // handle layout changes
    const layout = document.getElementById('layout');
    function setLayout(layoutType, splitRatio) {
      const panes = document.getElementById('panes');
      if (layoutType === 'topbottom') {
        panes.style.setProperty('--top-row-height', `${splitRatio * 100}%`);
        panes.style.gridTemplateRows = "var(--top-row-height) 1fr";
        panes.style.gridTemplateColumns = null;
      } else if (layoutType === 'leftright') {
        panes.style.setProperty('--left-column-width', `${splitRatio * 100}%`);
        panes.style.gridTemplateRows = null;
        panes.style.gridTemplateColumns = "var(--left-column-width) 1fr";
      }
    }
    layout.addEventListener('change', () => {
      layoutType = layout.value;
      setLayout(layoutType, splitRatio);
      updateDividerPosition(); // Ensure divider updates when layout changes
    });

    // handle changing the split ratio
    const divider = document.getElementById('divider');
    function updateDividerPosition() {
      if (layoutType === 'topbottom') {
        // For top/bottom layout, divider should be horizontal (spanning across)
        divider.className = 'horizontal-divider';
        divider.style.top = `calc(${splitRatio * 100}%)`;
        divider.style.left = '0';
      } else {
        // For left/right layout, divider should be vertical (spanning down)
        divider.className = 'vertical-divider';
        divider.style.left = `calc(${splitRatio * 100}%)`;
        divider.style.top = '0';
      }
    }

    // Add event listeners for dragging
    divider.addEventListener('mousedown', (e) => {
      isDragging = true;
      divider.classList.add('dragging');

      // Disable pointer events on the iframe to prevent it from capturing mouse events
      const iframe = document.getElementById('target');
      iframe.style.pointerEvents = 'none';

      e.preventDefault(); // Prevent text selection during drag
    });

    document.addEventListener('mousemove', (e) => {
      if (!isDragging) return;

      const panes = document.getElementById('panes');
      const rect = panes.getBoundingClientRect();

      if (layoutType === 'topbottom') {
        // Calculate new split ratio based on vertical position
        const newRatio = Math.max(0.1, Math.min(0.9, (e.clientY - rect.top) / rect.height));
        splitRatio = newRatio;
      } else {
        // Calculate new split ratio based on horizontal position
        const newRatio = Math.max(0.1, Math.min(0.9, (e.clientX - rect.left) / rect.width));
        splitRatio = newRatio;
      }

      // Update layout and divider position
      setLayout(layoutType, splitRatio);
      updateDividerPosition();
    });

    document.addEventListener('mouseup', () => {
      if (isDragging) {
        isDragging = false;
        divider.classList.remove('dragging');

        // Re-enable pointer events on the iframe
        const iframe = document.getElementById('target');
        iframe.style.pointerEvents = 'auto';
      }
    });

    // Initialize
    setLayout(
      layoutType,
      splitRatio,
    );
    updateDividerPosition();
  </script>
</body>

</html>
